Proper height above the roof is important when installing a heat pump rooftop unit:
A) So that snow does not block airflow through the outdoor coil.
B) So that the unit can be serviced from underneath.
C) To ensure adequate combustion air to the burners.
D) To allow the condenser to take advantage of local prevailing wind.
A
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Joseph Gibbs's cast his block in a mold, but the mold had dividers, so the finished block _____ .
A. split easily B. contained large frogs C. were not as durable D. had hollow cells
Which of the following can occur to raw paper?
A) Cut B) Folded C) Coated D) All of the above
Friction may be reduced by which of the following?
A. Applying greater force B. The use of lubrication C. The use of rollers D. Both B and C
The small shoots of the present season's growth are called _____
A) ?bud sticks B) ?budwood C) ?both of the above D) ?none of the above